WebCGM supports the following "intelligent" functions:
- Hyperlinking and document navigation
- Picture structuring and layering
- Search and query on WebCGM picture content.
CGM Open is dedicated to accelerating the further adoption, application, and implementation of CGM in general, with all of its profiles and variations. An important part of this work is the development and maintenance of WebCGM, an application of the ISO standard Computer Graphics Metafile for electronic documents.
WebCGM is a profile of the CGM graphics standard, developed collaboratively by CGM Open and the World Wide Web Consortium (W3C). Its primary purpose is to provide a reliable method of publishing two-dimensional technical graphics, complete with hot spots and hyperlinks on the World-Wide Web. The WebCGM profile defines standard metadata, behavior, an addressing scheme, and a simple but powerful subset of graphic primitives, so that technical graphics represented in the CGM format can be used effectively and reliably in multi-vendor WWW applications without fear of interoperability problems. CGM Open is committed to the continuing support and development of the WebCGM profile and all of the member companies that develop and market commercial software products have one or more products that currently support WebCGM.
CGM is a format defined by the International standard ISO/IEC 8632:1999 for digitally describing vector, raster, and hybrid (raster and vector) graphic pictures very compactly. It has proven to be an effective format for the representation of technical illustrations in electronic technical documentation, geophysical data visualization, and other demanding 2-dimensional graphics presentation applications.
WebCGM is an "intelligent graphics" profile of the CGM standard, which means that in addition to graphical content based on CGM Versions 1-3, the profile defines the semantics of non-graphical content (metadata) based on CGM Version 4, Application Structures. The non-graphical metadata allows the definition of hierarchies of graphical objects, complete with metadata, such as link specifications and layer definitions, that define the behavior of the graphical objects.
CGMs that are compliant with WebCGM are binary files that follow published applicable W3C requirements for a scalable graphics format. The design criteria for the graphical content of WebCGM balances graphical expressive power on the one hand, and simplicity and ease of implementation on the other. The Air Transport Association's (ATA) GREXCHANGE profile was taken as the starting point for the graphical content and modified only where it did not meet the requirements articulated in the W3C requirements. The graphical content of WebCGM is a simplified, but powerful subset of the ATA's GREXCHANGE profile.
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